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8.1 Exchange surfaces and diffusion

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Question 40
H

Two lung conditions are described in the table.

Table

ConditionChange from a healthy lung
PSome alveolar walls are lost, reducing total exchange area.
QAlveolar walls become thicker, with no change in exchange area.

Which statement identifies the cause of reduced oxygen uptake in both conditions?

[1]
A

P increases the distance for diffusion; Q reduces the area for diffusion.

B

P reduces the area for diffusion; Q decreases the distance for diffusion.

C

P reduces the area for diffusion; Q increases the distance for diffusion.

D

P decreases the distance for diffusion; Q reduces the area for diffusion.

Markscheme

8.1 Exchange surfaces and diffusion Questions

  1. GCSE
  2. /Biology
  3. /8.1 Exchange surfaces and diffusion

102 exam-style questions on Edexcel GCSE Biology 8.1 Exchange surfaces and diffusion, covering 8.1.1 Introduction to exchange and transport, 8.1.2 Alveoli adapted for gas exchange, 8.1.3 Factors affecting rate of diffusion, and 8.1.4 Rate of diffusion using Fick's law. Each one has a worked solution and a mark scheme showing where the marks go.

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